关键词: O₃, 前体物, 气象因素, 变化特征

Abstract:

There were three greenhouse gases observation sites in Taiyuan, Datong and Linfen in Shanxi Province, and the continuous measurements of O3, NOX, NO2, NO and CO were carried out from 2012. Based on the observation data of O3 and its precursors from the three observation sites in summer of 2012, the characteristics and the temporal variations of ozone and its precursors were analyzed firstly, and the meteorological factors influencing ozone concentration were discussed. The results showed that both of the one-hour concentration and the daily maximum 8-hour concentration of ozone exceeded the Ambient Air Quality Standard (GB3095-2012) 2 grade in three cities, and in summer the most serious pollution of ozone occurred in Linfen, while the lowest pollution occurred in Datong. The diurnal variations of O3 concentration in three sites presented mono-peak pattern with the peak value occurring around 15:00 and the minimum value occurring around 06:00, while the variation trends of the precursors were negatively correlated with O3 concentration. Comparatively, temperature was the most important factor influencing O3 concentration among the meteorological factors, and then down to relative humidity and wind speed. The high O3 concentration was mostly accompanied by high temperature and low relative humidity in the early afternoon in summer. The affecting degree of meteorological factors on O3 concentration was different in each site.

Key words:  , ozone；precursors；meteorological factors；variation characteristics